Bluz\Cache\Adapter\FileBase::writeFile PHP Method

    protected function writeFile($fileName, $content)
    {
        $tempFileName = $fileName . uniqid('', true) . '.temp';
        $bytes = file_put_contents($tempFileName, $content);
        if ($bytes !== false) {
            if (rename($tempFileName, $fileName)) {
                return $bytes;
            }
            @unlink($tempFileName);
        }
        return false;
    }